Null fill

Null fill

Null fill is used in radio antenna systems which are located on mountains or tall towers, to prevent too much of the signal from overshooting the nearest part of intended coverage area. Phasing is used between antenna elements to take power away from the main lobe and electrically direct more of it at a more downward angle in the vertical plane. This requires a phased array. Changing the relative power supplied to each element also changes the radiation pattern in this manner, and often both methods are used in combination.

References

  • "Analysis of Antenna Null-fill and Broadcast Coverage." Myron D. Fanton. ERI Technical Series, vol. 6, April 2006.[1]
  • "The Tide is Turning." Charles Rhodes. [2]
  • "A Study on Null-Fill Array Antenna for Service Coverage Expansion in PCS Band" Youngseok Ko

See also


Wikimedia Foundation. 2010.

Игры ⚽ Нужно сделать НИР?

Look at other dictionaries:

  • Null (radio) — Yagi Uda antenna polar pattern showing pattern of alternating lobes and nulls In radio electronics, a null is an area or vector in an antenna s radiation pattern where the signal cancels out almost entirely. This can be an advantage, as nulls in… …   Wikipedia

  • Null character — For other uses, see Null symbol. The null character (also null terminator), abbreviated NUL, is a control character with the value zero.[1] [2] It is present in many character sets, including ISO/IEC 646 (or ASCII), the C0 control code, the… …   Wikipedia

  • Null-subject language — In linguistic typology, a null subject language is a language whose grammar permits an independent clause to lack an explicit subject. Such a clause is then said to have a null subject. Typically, null subject languages express person, number,… …   Wikipedia

  • Null subject language — In linguistic typology, a null subject language is a language whose grammar permits an independent clause to lack an explicit subject. Such a clause is then said to have a null subject. Typically, null subject languages express person, number,… …   Wikipedia

  • Fill character — In computer terminology, a fill character is a character transmitted solely for the purpose of consuming time. It does this by filling a timeslot on a data transmission line which would otherwise be forced to be idle (empty). In this way, fill… …   Wikipedia

  • EIA-708 — is the standard for closed captioning for ATSC digital television streams in the United States and Canada. It was developed by the Electronic Industries Alliance.Unlike most DVB captions, EIA 708 captions are textual like traditional Line 21… …   Wikipedia

  • MASM — Der Microsoft Macro Assembler (abgekürzt MASM) ist ein von Microsoft entwickelter Assembler für x86 basierende Prozessoren. Er übersetzt Assemblerquelltext in ausführbaren, nativen Maschinencode. Der Microsoft Macro Assembler entwickelte sich… …   Deutsch Wikipedia

  • Masm32 — Der Microsoft Macro Assembler (abgekürzt MASM) ist ein von Microsoft entwickelter Assembler für x86 basierende Prozessoren. Er übersetzt Assemblerquelltext in ausführbaren, nativen Maschinencode. Der Microsoft Macro Assembler entwickelte sich… …   Deutsch Wikipedia

  • Microsoft Assembler — Der Microsoft Macro Assembler (abgekürzt MASM) ist ein von Microsoft entwickelter Assembler für x86 basierende Prozessoren. Er übersetzt Assemblerquelltext in ausführbaren, nativen Maschinencode. Der Microsoft Macro Assembler entwickelte sich… …   Deutsch Wikipedia

  • Microsoft Macro Assembler — Der Microsoft Macro Assembler (abgekürzt MASM) ist ein von Microsoft entwickelter Assembler für x86 basierende Prozessoren. Er übersetzt Assemblerquelltext in ausführbaren, nativen Maschinencode. Der Microsoft Macro Assembler entwickelte sich… …   Deutsch Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”